Pump jack



l Marh `15, 19727.

W. G. JENSEN ET AL PUMP JACK Filed March 1. 1926 2 Sheets-Shoot: 1

. ATTORNEYS s@ @W w A f 1,621 414 March 15 1927' w. G. JENSEN ET Al.

PUMP JACK Filed March 1, 1926 2. Sheets-Sheet 2 INVENTOR A dense ATTORNEYS Ul V Patented Mar. 15, 1927.'

PUMP JAG-1:.

fApplcationfledMarch 1, 1926. Seria1`fNo.9l,594.

.ffThis invention yrelates to-an improvement in pump jacks of the type forming the sub-` m'atterof theprior patent referred to and` which alsolfeliminates vibration which has advantageouscounterbalancing features and which isxofrstrongand durable lconstruction, reliable `and effective in -operatiom and easy and comparatively inexpensive to manuf facture.

Otheriobjects and advantages ','reside in certains novel features of the construction, arrangement and combination of parts which will-bc(liereina'fterfmore fully described and Vparticularly pointed f out in the appended claimsyreference, being-had to the accom-ll panying drawings forming a specification, and infwhi'ch:hr Y

' Figurelis azfperspective view-showing one part of this v embodiment of' the invention,`

Figure 2 is a view' partly in vert-icalalongi-l tudinal 'sectionand partly lin side elevation, and f y Figure 3fisfa ffragmentaiy View fin. transverse 'v'eitical section 'taken approximately on the( line? 3-3 of'Figu're 2.

Referring to the drawings it will be seen` that the pump jack includes a stationary frame, designated generally at 1 and having base bars 2, vertical standards 3 and inclined braces 4 connecting the base bars and the vertical standards. The standards 3 and brace bars 4 are held in transversely spaced relation by means of spacing members 3a and 4a. The base bars 2 are secured to the lower ends of the standards 3 at one end and at the lower end of the braces 4 at theirA other ends. The upper ends of the standards 3 and .braces 4 are suitably secured together. r The base bars 2 are maintained in spaced relation by means of transversely eX- tending members 6 which have their upper surfaces hollowed out to provide bearings 7 for purposes which will hereinafter more clearly appear. A walking beam, designated generally at 10, is provided and is made up of a pair of channel iron members 11 fastened together in spaced relation. The walking beam 10 is fulcrumed intermediate its ends on the upper end 0f a pivot post or support 12. The post 12 includes a pair of members 13 connected at their lower ends by a hollow supporting-shaft 14 which is rotatable on the bearingsurface71ofwone ofl the spacing: membersG.. The hollowf'supporting:shaft 14fovf the pivoter] support is helden Iits 'bearing surface l7` by means of a pivot ybolt f141fexqtendedV thrughv the supporting shaft-and throufghtlie Y'vert-ical flanges of the basebars 2`-ofr the stationary: frame. AAttlieir upper endsf theimembersv13 are connectedby top l piece I11o and'alsohavetransversely alignedk a'perturedxears 16 through vwhiclifaapivot" bolt 17 is'extended. A'The ,pivot-bolt 17-'ris also extended :through -the opening 18 ofi a 'supporting .or 4'fulcrum block 219 lwhich is v` po'sitiened between thefmezmbers'll of the'wal'k-y ing beam and fastened'thereto, aszindicated at 2O.` AAs shownin Figure-2.the-topzpiece 15 :is `liollowed 'out Ytoiprovidea .bearing cavity 15"L in which fthe*lowerrounded end of the fuflcrnin-'block 19 is fit-ted. 1

Wvitlrthe :arrangement described the'ivalkingbeamis mounted forlrockin'g or oscillat-V ing` :movement on the pivoted :slot vbut 'j ldrie to the factthat vthe support is pivot-ed ffthe Walking beam may movebodily in si'ichman` ner as to'cause theend Vthereof connected with-the polish lrod .to move inla; substantially vstraight fline. yIn order f to constrain the walkingbeam @tofsproper movement-to eifectfzth eipurposefj ust stated,4 a 4pairof links`I 25 are provided between the walkingibeam and the stationary frame 1. One end of each link 25 is pivotally connected vto the upper end of the stationary frame and the other end of each link is pivotally connected to the walking beam. As shown in the drawings, the ends of the links 25 which are connected to the main frame are so connected by means of bolts and nuts 26 whereas the I opposite ends of the links are connected by bolts and nuts 27 to the channel members 11l of the walking beam 10. As rillustrated in Fig. 3the links 25 are properlybent to olfset their ends in the necessary manner.

As indicated, one endV of the walking beam is connected to the polish rod P and the opposite lend of the walking beam is provided with a'bearing 30 adapted to. receive a counterbalance or weight 31 which makes the entire assembly easy and smooth in operation and entirely devoid of vibration.

Means is provided for imparting rocking motion to the walking beam and this means includes a rocking frame, designated generally at 35, and including a pair of converging base members 36 fastened, asv at 37 to lugs 38 provided on a hollow'rock shaft andsecured at their other ends to a pivot block 40. A yoke-shaped frame member 41 is provided and has the lower ends of its arms 42 also fastened to the vlugs 38. The body portion 43 of the yoke frame member 41 is spanned by brace. membersy 44 which extend down and are connected to the converging ends of the base members 36. With this arrangement the advantages of a truss are obtained in the rocking frame. The rocking frame is mounted for rocking movement on the stationary frame by means of its hollow rock shaft 39 which has a working fit-on the bearing surface 7 of one of the cross members 6 as shown in Fig. 2 and which is'held in such position by means of apivot bolt 45. The pivot block `is pron vided with spaced and apertured ears 46 a connecting rod 48. 48 is provided at its upper end with a second which receive between them the apertured cross head 47 provided at the lower end of The connecting vrod cross head 49 having aligned and apertured ears 50 co-acting with ak pivot bolt'51 to connect the cross head 49 to a pivot block 52 fastened, as at 50, to the channel members 11 of the walking beam and having aY rounded portion 54fat its lower end rotatably fitted in a bearing surface 55 provided therefor on lthe head 51. As shown in Figure 2 the on a similar bearing surface 46a provided in the pivotblock 40a.

The yoke member 41 is extended above its connection with the brace members 44 and is provided with a series of transverse grooves wherebv the rocking frame mayy Y be adjustably connected to the shackle rod lower head 46 is rotatably fitted' lines 61 to vary the stroke of the polish rod. l/Vith this arrangement. when theY outer end of the walking beam is swung upwardly.

tages the .pump jack has all of the features of ruggedness and strength required in actual practice. We claim: 1. A pump jack having a stationary frame provided with transversely extending bearing members having Vbearing Y recesses, a pivotedsupport having ay hollow shaft in its lower end engaging the recesses of one of the bearingmembers, means for` holding lsaid shaft engaged with its bearing recess,

a walking beam fulcrumed on the upper end of the pivotal support, links vbetween the walking beam and the main frame for constraining the walking beam to proper movement, means for rockingl the walking beam including a rocking bea-m havingV aA shaft rotatably lmounted in therecess of one of the bearing members,- and a connection between the rocking' frame and the walking beam. Y y n 2. A pump jack having a walking beam,

means for rocking the same including a rocking Vframe made up of converging base l bars, a rockl shaft having lugs connected to the bars at one end, a yoke member connected to said lugs, and inclined bars between the yoke and the base bars. g WILLIAM Gr. JENSEN. KRESTEN R. JENSEN. 

